Going early?

Irene

I've googled, but it hasn't helped much... How do u know if ur going early? I'm almost 36 weeks. I've had back pain for the last few days but now it's lower and a lot more constant and painful. Today I've had cramps (which I haven't had the whole pregnancy), and pressure like I have to go to the bathroom but don't. Kinda freaking out!

Thanks!